Improvement in manual power



UNITED STATES PATENT OFFICE,

VJOHN H. YAGER, on rannfron, onto.A

IMPROVEMENT IN MANUAL POWER.

Speciiication forming part of Letters Patent No. 53,117, dated October 23, 1866.

To all whom it may concern:

Be it known that l, JOHN H. Ynena, of Trenton, in the county of Butler and State of Ohio, have invented a new and Im proved Manual Power 5 and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part ot' this specification, in which- Figure l is a sectional side elevation or vertical section ofthe machine at the line a: Fig. 2,. Fig. 2 is a front elevation, with the parts of lthe frame broken out to expose the crank-lever fulcrums.

Similar letters of reference indicatel like Y parts.

The object of this invention is to supply a compact and powerful manual power by means ot' two double levers which operate together upon a double crank-shaft in such manner as to counteract the dead-center and convert a reciprocating into an uninterrupted rotary motion, whereby the power applied to the levers is exerted constantly to the greatest advantage. One man or several men can work the machine, and by alternately operating with the foot and the hand all their weight and strength will be fully applied without strain or fatigue. It is applicable to hand-cars for railroads7 hand-mills, grindstonesfsaws, hoisting apparatus, and various purposes where manual power is most available.

A A represent the foundation on which the machine is erected, consisting of two lon-g side timbers with cross-braces B B at the ends. Firmly secured to these timbers is an upright frame formed by four posts, C C O O, set in corners ot a square, and united at top with girders D D, and in the middle or half-way up by two cross timbers or bearers, E E, for supporting the crank-shaft a a., on one end of which is placed a y-wheel, F.

Two double levers or brakes, b b and b b', have their fulcrums or bearings aboveand below the crank-shaft a a, being suspended on rock-shafts c c,vwhich have their bearings in sliding boXes d d and d d', Fig. 2, playing up and down in vertical slots m m between the studs e e, which hang down from the girders D D at the top, and slots m m between the studs e e', which stand upright on the foundation A at the bottom of the machine, as shown in Fig. 1. It will be observed that both slots are placed out of perpendicular line with the crank-shaft a a.

The two double brakes b b and b b are-connected with the crank-shaft a a, and also with each other, by rods.

The foot-brake b b is direct-ly connected with both cranks on the shaft-on one side, by

the straight rod f, with one of the cranks, and on the other side, with the other crank, by the straight rod f; and the upper hand-brake, b b, isalso connected with both cranks by means of two links on each, or jointed rods g g and and g' g', in the same manner. rEhe rods are pivoted on the brakes, and are connected with the crank-shaft a a by couplings l1. It around the two cranks.

The machine is operated -by bearing down and raising the brakes alternately, the hand being applied to the upper brake, b b, while at the same time the foot of the operator is applied to the lower brake, b b', the weight of the body being thrown upon one or the other of the double brakes alternately, which are worked on either or both sides by one or more persons.

The dead-center is overcome by placing the slots m m', with the rock shafts or bearings of the brakes sliding in them, out of line Vertically with the crank-shaft a a, and the counteracting effect of the jointed connecting-rods g g and g' g', acting on the cranks at different points and positions in their revolution, producing a continuous regular motion, which is always under the control of' the operator, and enabling the machine to start or stop or be reversed at pleasure readily at any point or position of the cranks. Y

Having fully described the construction and operation of my invention, what I claim as new, and desire to secure by Letters Patent, 1s

The double brakes -b b and b' b', with their rock-shafts c c', and connecting-rods f and f and g g g g', in combination with the vertical slots m m and m' m', and the erankshaft a a, the whole being constructed, arranged, and operated substantially as and for the purposes herein described.

JOHN H. YAGER. Witnesses:

JOHN T. LAW, ISAAC MARKS. 

